5. Aluminium alloy pistons are preferred becausea. They are good absorbers of shockb. They are having less weightc. They have good water resistanced. They are very strong in tensionAns : B

6. When preparing electrolyte, it is important to remember thata. Acid and water should be poured togetherb. Water should be poured into acidc. Acid should be poured into waterAns : C

7. When the plates of battery cell are made larger in size, we get increased ............a. Currentb. Voltagec. Cell resistanceAns : A

8. The most commonly used material for tyre tubes isa. Butylb. Natural rubberc. ButaneAns : A

9. Conformability of an engine bearing isa. Ability of a bearing to withstand the wear and tearb. Resistivity to corrosionc. Ability of the bearing to adjust itself to variations in shaft alignment and journal shaped. Ability of a bearing to permit foreign particles to embed in itAns : C

26. Two of the three connecting rod bearing loads that increase as engine speeds increase area. Centrifugal and inertia loadsb. Torsional and pressure loadsc. Pressure and inertia loadsd. Pressure and centrifugal loadsAns : A

27. In the engine there must be relative motion between the piston and the connecting roda. Atmospheric pressure, inertia and torsional vibrationb. Centrifugal force, inertia and combustion pressurec. Inertia, engine speed and centrifugal forceAns : B

30. Twisting and untwisting of the crankshaft is calleda. Torsional vibrationb. Power impulsionc. Torsional balanceAns : A

31. As a rule when comparing the front and rear wheel cylinder pistons, it will be found that the pistons in the front wheel cylinders area. The same sizeb. Larger in diameterc. Smaller in diameterAns : B

32. The ratio of the cylinder volume at BDC and the clearance volume is calleda. Clearance ratiob. Volumetric ratioc. Compression ratioAns : C

33. The power developed inside the engine cylinder is calleda. IHPb. FHPc. BHPAns : A

34. In normal operation the part of the exhaust valve that gets the hottest isa. Faceb. Middle of Stemc. Centre of headd. Edge of marginAns : C

35. In an operating engine, the hottest part of the piston is thea. Headb. Ring groovesc. Skirtd. Pin bossesAns : A

36. The size of an engine cylinder is referred to in terms of itsa. Diameter and boreb. Bore and lengthc. Bore and strokeAns : C

37. The amount of air fuel mixture taken in by the engine on the suction stroke is a measure of the engine'sa. Compression ratiob. Volumetric efficiencyc. Clearance volumeAns : B

38. The device for smoothing out the power impulses from the engine is called thea. Flywheelb. Camshaftc. Crankshaftd. ClutchAns : A

39. In the diesel engine, the compression ratio is as high asa. 10:1b. 15:1c. 5:1Ans : B

40. The percentage of the energy in the petrol burnt in the engine which is actually utilized in propelling the car is as little asa. 25%b. 60%c. 35%d. 15%Ans : A